@article{IVM_1969_2_a8,
     author = {B. A. Rozenfel'd and N. N. Adamushko},
     title = {The principle of triality in quasi-elliptic and quasi-hyperbolic spaces},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {79--87},
     publisher = {mathdoc},
     number = {2},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1969_2_a8/}
}